Claude Frédéric Bastiat (French: [klod fʁedeʁik bastja]; 30 June 1801 – 24 December 1850) was a French classical liberal theorist, political economist, Freemason, and member of the French National Assembly. He was notable for developing the economic concept of opportunity cost, and for introducing the Parable of the Broken Window or the "Glazier's fallacy". His ideas have provided a basis for libertarianism and the Austrian School.